A comprehensive compilation of research findings and the results of extensive field experience. This has become a bible for professional arborists. To order, please visit arborday.org/books and a portion of your purchase price will be returned to the Arbor Day Foundation for its educational programs.

Arborist’s Certification Study Guide

This is the book used by professionals who are preparing to take an exam leading to arborist certification by the International Society of Arboriculture (ISA). It can be equally instructive for lay people with a serious interest in trees. It is an excellent source of information about how trees function and their proper planting and maintenance. Available at the ISA website.

Books and visual aids by Alex L. Shigo

The late Dr. Alex Shigo was a pioneer in the knowledge of tree growth and response to pruning or other treatments. Especially pertinent to Tree City USA Bulletin No. 38 are:

A New Tree Biology

Tree Anatomy

Modern Arboriculture

For a complete listing of publications and visual aids created by Dr. Shigo, visit Shigo and Trees.